The 20-mile causeway that separates the Netherlands from the sea.

France's high-tech, future-themed amusement park.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

A 16th-century horror show built in a lovely Italian garden.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Geothermal waterfalls in Tuscany.

Five candy-colored villages on the Italian Riviera.

A lover's walk between hilltop towns, decorated with graffiti love notes.

The bomb-ravaged remains of of a colossal Neptune.

Massive galleon from a box-office bomb docked in Genoa.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Abandoned Nazi train station turned underground astroparticle laboratory.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

A surreal statue honoring Prague's favorite literary son.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.